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-rw-r--r--acinclude.m440
1 files changed, 40 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4
index 9656eac3..566953df 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -6583,3 +6583,43 @@ SED=$lt_cv_path_SED
AC_SUBST([SED])
AC_MSG_RESULT([$SED])
])
+
+
+dnl Add some custom macros for pacman and libalpm
+
+dnl GCC_STACK_PROTECT_LIB
+dnl adds -lssp to LIBS if it is available
+dnl ssp is usually provided as part of libc, but was previously a separate lib
+dnl It does not hurt to add -lssp even if libc provides SSP - in that case
+dnl libssp will simply be ignored.
+AC_DEFUN([GCC_STACK_PROTECT_LIB],[
+ AC_CACHE_CHECK([whether libssp exists], ssp_cv_lib,
+ [ssp_old_libs="$LIBS"
+ LIBS="$LIBS -lssp"
+ AC_TRY_LINK(,, ssp_cv_lib=yes, ssp_cv_lib=no)
+ LIBS="$ssp_old_libs"
+ ])
+ if test $ssp_cv_lib = yes; then
+ LIBS="$LIBS -lssp"
+ fi
+])
+
+dnl GCC_STACK_PROTECT_CC
+dnl checks -fstack-protector with the C compiler, if it exists then updates
+dnl CFLAGS and defines ENABLE_SSP_CC
+AC_DEFUN([GCC_STACK_PROTECT_CC],[
+ AC_LANG_ASSERT(C)
+ if test "X$CC" != "X"; then
+ AC_CACHE_CHECK([whether ${CC} accepts -fstack-protector],
+ ssp_cv_cc,
+ [ssp_old_cflags="$CFLAGS"
+ CFLAGS="$CFLAGS -fstack-protector"
+ AC_TRY_COMPILE(,, ssp_cv_cc=yes, ssp_cv_cc=no)
+ CFLAGS="$ssp_old_cflags"
+ ])
+ if test $ssp_cv_cc = yes; then
+ CFLAGS="$CFLAGS -fstack-protector"
+ AC_DEFINE([ENABLE_SSP_CC], 1, [Define if SSP C support is enabled.])
+ fi
+ fi
+])